Chicago-latrobe 50503 Extra Length Drill Bit 5/16 in Hss

Product Description

The CHICAGO-LATROBE 50503 is an extra length, high speed steel drill bit designed for long reach drilling applications in metal fabrication, mechanical contracting, and industrial maintenance work. Built to Series 120X specifications, this bit measures 5/16 inch (0.3125 inch) in diameter with an overall length of 8 inches and a flute length of 5.5 inches, giving it the extended reach needed to access deep or obstructed bore locations that standard-length bits cannot reach. The 118-degree notched point and web-thinned, tapered web construction reduce thrust and improve chip evacuation at cut initiation. An oxide finish provides baseline surface protection. Licensed trades and industrial machinists rely on this bit when standard-length tooling falls short.

The CHICAGO-LATROBE 50503 is suited for right-hand cutting in cast iron and steel workpieces across residential and commercial service environments. Typical applications include deep-hole drilling through structural members, equipment frames, enclosures, and mechanical assemblies where clearance depth exceeds standard drill bit reach. The straight-cylindrical shank accepts standard 3-jaw chucks, making it compatible with corded drills, drill presses, and magnetic base drills common in trade and shop settings. The 2-flute spiral configuration maintains chip flow during extended-depth passes.

Key Features

• 5/16 inch diameter with 8 inch overall length for long reach access
• High speed steel construction rated for cast iron and steel cutting
• 118-degree notched drill point reduces walking and improves entry in metal
• Web-thinned, tapered web lowers thrust requirements at the cutting tip
• Oxide finish provides corrosion and heat resistance during service
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters

Compatibility

Designed as a general-purpose extra length drill bit for use in standard 3-jaw chucks; primary workpiece materials are cast iron and steel as specified by the manufacturer.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with metal drilling procedures. Secure the workpiece firmly before drilling and confirm chuck jaw engagement on the full shank diameter before operation. Reduce feed rate and apply appropriate cutting fluid when drilling deep holes in steel to manage heat buildup and extend tool life. Always wear appropriate eye protection and follow applicable shop safety standards when operating rotary cutting tools.